Hacking the World; Using an Arduino or two

Location awareness. GPS doesn’t work inside buildings. House set temperature
depending on where you are.

Notification.

Performance. Sports.

Environmental monitoring / control.

Sensors

buttons

temperature

accelerometer

gyroscopes

pressure

etc

Wires that can be sewn on to garments are either thick (and require old sewing
machine) or thin (and have high resistance - especially a problem with high
current as ohms law says there will be a large voltage drop). Other options
might be available.